rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=969/1/0x4000000000000000 softirq=10651/10651 fqs=5245 
	(t=10502 jiffies g=11093 q=2810)
NMI backtrace for cpu 0
CPU: 0 PID: 8640 Comm: vhost-8637 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:iotlb_access_ok+0x2ad/0x3e0 drivers/vhost/vhost.c:1349
Code: 4c 03 63 38 48 89 ee 48 8b 3c 24 4d 89 e7 e8 ea a9 b0 fa 49 29 ef 48 39 2c 24 0f 85 f0 fe ff ff e8 08 a4 b0 fa 48 8b 6c 24 08 <4c> 89 fe 48 89 ef e8 c8 a9 b0 fa 4c 39 fd 0f 87 d2 fe ff ff e8 ea
RSP: 0018:ffffc90018d8fb28 EFLAGS: 00000246
RAX: 0000000000040000 RBX: ffff88804b50cc80 RCX: ffffc90018551000
RDX: 0000000000040000 RSI: ffffffff86c720a8 RDI: 0000000000000003
RBP: 0000000000000010 R08: 0000000000000000 R09: ffffc90018d8fb1f
R10: ffffffff86c72096 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000
 vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366
 handle_rx+0x145/0x1b40 drivers/vhost/net.c:1140
 vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
   0:	4c 03 63 38          	add    0x38(%rbx),%r12
   4:	48 89 ee             	mov    %rbp,%rsi
   7:	48 8b 3c 24          	mov    (%rsp),%rdi
   b:	4d 89 e7             	mov    %r12,%r15
   e:	e8 ea a9 b0 fa       	callq  0xfab0a9fd
  13:	49 29 ef             	sub    %rbp,%r15
  16:	48 39 2c 24          	cmp    %rbp,(%rsp)
  1a:	0f 85 f0 fe ff ff    	jne    0xffffff10
  20:	e8 08 a4 b0 fa       	callq  0xfab0a42d
  25:	48 8b 6c 24 08       	mov    0x8(%rsp),%rbp
* 2a:	4c 89 fe             	mov    %r15,%rsi <-- trapping instruction
  2d:	48 89 ef             	mov    %rbp,%rdi
  30:	e8 c8 a9 b0 fa       	callq  0xfab0a9fd
  35:	4c 39 fd             	cmp    %r15,%rbp
  38:	0f 87 d2 fe ff ff    	ja     0xffffff10
  3e:	e8                   	.byte 0xe8
  3f:	ea                   	(bad)